小编程（三）：用户登录注册界面开发及用户信息管理案例代码详解
16lz
2021-12-04
用户登录注册界面开发及用户信息管理案例详解
刚开始接触Android编程，这算是我写的第一个简单工程，主要功能有：用户登录、注册、注销、修改密码、记住密码共5个基本操作，其内容涉及到以下几点：
1：Button，TextView，TextEdit，ImageView，RatioButton等基本控件的使用；
2：多个Activities之间的切换；
3：使用Android本地数据库来管理用户信息。
实现上述功能的主要参考资料：CSDN博客之星郭霖大牛写的《第一行代码—Android》，个人比较喜欢看纸质的资料，所以买了这本书，大牛的博客主页链接http://my.csdn.net/sinyu890807。其次是参考了网上的一个用户登录注册的程序，在此基础上按照自己的需求慢慢添加完善一些功能，并且将原来的单个avtivity换用多个activity实现，UI设计也更加漂亮美观。
先上几个图【我在android6.0.1的真机上调试的】：
下面是用户登录和用户注册界面。
下面是用户密码修改和个人中心界面。
一、工程代码
整个工程是在Android Studio 2.1.1环境下实现的，源码下载链接在末尾给出，下面是工程目录：这里先贴出各个布局文件.xml，各个类内容和各个activity代码：
1：几个界面布局文件.xml
login.xml【登录界面】<?xml version="1.0" encoding="utf-8"?> <?xml version="1.0" encoding="utf-8"?> <?xml version="1.0" encoding="utf-8"?> <?xml version="1.0" encoding="utf-8"?> 2：用户数据管理的类
UserData.java 【用户数据】package com.example.foolishfan.user_v10;public class UserData { private String userName; //用户名 private String userPwd; //用户密码 private int userId; //用户ID号 public int pwdresetFlag=0; //获取用户名 public String getUserName() { //获取用户名 return userName; } //设置用户名 public void setUserName(String userName) { //输入用户名 this.userName = userName; } //获取用户密码 public String getUserPwd() { //获取用户密码 return userPwd; } //设置用户密码 public void setUserPwd(String userPwd) { //输入用户密码 this.userPwd = userPwd; } //获取用户id public int getUserId() { //获取用户ID号 return userId; } //设置用户id public void setUserId(int userId) { //设置用户ID号 this.userId = userId; } public UserData(String userName, String userPwd) { //这里只采用用户名和密码 super(); this.userName = userName; this.userPwd = userPwd; }}package com.example.foolishfan.user_v10;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.database.SQLException;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;import android.util.Log;public class UserDataManager { //用户数据管理类 //一些宏定义和声明 private static final String TAG = "UserDataManager"; private static final String DB_NAME = "user_data"; private static final String TABLE_NAME = "users"; public static final String ID = "_id"; public static final String USER_NAME = "user_name"; public static final String USER_PWD = "user_pwd";// public static final String SILENT = "silent";// public static final String VIBRATE = "vibrate"; private static final int DB_VERSION = 2; private Context mContext = null; //创建用户book表 private static final String DB_CREATE = "CREATE TABLE " + TABLE_NAME + " (" + ID + " integer primary key," + USER_NAME + " varchar," + USER_PWD + " varchar" + ");"; private SQLiteDatabase mSQLiteDatabase = null; private DataBaseManagementHelper mDatabaseHelper = null; //DataBaseManagementHelper继承自SQLiteOpenHelper private static class DataBaseManagementHelper extends SQLiteOpenHelper { DataBaseManagementHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); } @Override public void onCreate(SQLiteDatabase db) { Log.i(TAG,"db.getVersion()="+db.getVersion()); db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME + ";"); db.execSQL(DB_CREATE); Log.i(TAG, "db.execSQL(DB_CREATE)"); Log.e(TAG, DB_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { Log.i(TAG, "DataBaseManagementHelper onUpgrade"); onCreate(db); } } public UserDataManager(Context context) { mContext = context; Log.i(TAG, "UserDataManager construction!"); } //打开数据库 public void openDataBase() throws SQLException { mDatabaseHelper = new DataBaseManagementHelper(mContext); mSQLiteDatabase = mDatabaseHelper.getWritableDatabase(); } //关闭数据库 public void closeDataBase() throws SQLException { mDatabaseHelper.close(); } //添加新用户，即注册 public long insertUserData(UserData userData) { String userName=userData.getUserName(); String userPwd=userData.getUserPwd(); ContentValues values = new ContentValues(); values.put(USER_NAME, userName); values.put(USER_PWD, userPwd); return mSQLiteDatabase.insert(TABLE_NAME, ID, values); } //更新用户信息，如修改密码 public boolean updateUserData(UserData userData) { //int id = userData.getUserId(); String userName = userData.getUserName(); String userPwd = userData.getUserPwd(); ContentValues values = new ContentValues(); values.put(USER_NAME, userName); values.put(USER_PWD, userPwd); return mSQLiteDatabase.update(TABLE_NAME, values,null, null) > 0; //return mSQLiteDatabase.update(TABLE_NAME, values, ID + "=" + id, null) > 0; } // public Cursor fetchUserData(int id) throws SQLException { Cursor mCursor = mSQLiteDatabase.query(false, TABLE_NAME, null, ID + "=" + id, null, null, null, null, null); if (mCursor != null) { mCursor.moveToFirst(); } return mCursor; } // public Cursor fetchAllUserDatas() { return mSQLiteDatabase.query(TABLE_NAME, null, null, null, null, null, null); } //根据id删除用户 public boolean deleteUserData(int id) { return mSQLiteDatabase.delete(TABLE_NAME, ID + "=" + id, null) > 0; } //根据用户名注销 public boolean deleteUserDatabyname(String name) { return mSQLiteDatabase.delete(TABLE_NAME, USER_NAME + "=" + name, null) > 0; } //删除所有用户 public boolean deleteAllUserDatas() { return mSQLiteDatabase.delete(TABLE_NAME, null, null) > 0; } // public String getStringByColumnName(String columnName, int id) { Cursor mCursor = fetchUserData(id); int columnIndex = mCursor.getColumnIndex(columnName); String columnValue = mCursor.getString(columnIndex); mCursor.close(); return columnValue; } // public boolean updateUserDataById(String columnName, int id, String columnValue) { ContentValues values = new ContentValues(); values.put(columnName, columnValue); return mSQLiteDatabase.update(TABLE_NAME, values, ID + "=" + id, null) > 0; } //根据用户名找用户，可以判断注册时用户名是否已经存在 public int findUserByName(String userName){ Log.i(TAG,"findUserByName , userName="+userName); int result=0; Cursor mCursor=mSQLiteDatabase.query(TABLE_NAME, null, USER_NAME+"="+userName, null, null, null, null); if(mCursor!=null){ result=mCursor.getCount(); mCursor.close(); Log.i(TAG,"findUserByName , result="+result); } return result; } //根据用户名和密码找用户，用于登录 public int findUserByNameAndPwd(String userName,String pwd){ Log.i(TAG,"findUserByNameAndPwd"); int result=0; Cursor mCursor=mSQLiteDatabase.query(TABLE_NAME, null, USER_NAME+"="+userName+" and "+USER_PWD+"="+pwd, null, null, null, null); if(mCursor!=null){ result=mCursor.getCount(); mCursor.close(); Log.i(TAG,"findUserByNameAndPwd , result="+result); } return result; }}3：具体操作的实现代码，即各个activity
Login.java【用户登录activity】package com.example.foolishfan.user_v10;import android.app.Activity;import android.content.Intent;import android.content.SharedPreferences;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class Login extends Activity { //登录界面活动 public int pwdresetFlag=0; private EditText mAccount; //用户名编辑 private EditText mPwd; //密码编辑 private Button mRegisterButton; //注册按钮 private Button mLoginButton; //登录按钮 private Button mCancleButton; //注销按钮 private CheckBox mRememberCheck; private SharedPreferences login_sp; private String userNameValue,passwordValue; private View loginView; //登录 private View loginSuccessView; private TextView loginSuccessShow; private TextView mChangepwdText; private UserDataManager mUserDataManager; //用户数据管理类 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login); //通过id找到相应的控件 mAccount = (EditText) findViewById(R.id.login_edit_account); mPwd = (EditText) findViewById(R.id.login_edit_pwd); mRegisterButton = (Button) findViewById(R.id.login_btn_register); mLoginButton = (Button) findViewById(R.id.login_btn_login); mCancleButton = (Button) findViewById(R.id.login_btn_cancle); loginView=findViewById(R.id.login_view); loginSuccessView=findViewById(R.id.login_success_view); loginSuccessShow=(TextView) findViewById(R.id.login_success_show); mChangepwdText = (TextView) findViewById(R.id.login_text_change_pwd); mRememberCheck = (CheckBox) findViewById(R.id.Login_Remember); login_sp = getSharedPreferences("userInfo", 0); String name=login_sp.getString("USER_NAME", ""); String pwd =login_sp.getString("PASSWORD", ""); boolean choseRemember =login_sp.getBoolean("mRememberCheck", false); boolean choseAutoLogin =login_sp.getBoolean("mAutologinCheck", false); //如果上次选了记住密码，那进入登录页面也自动勾选记住密码，并填上用户名和密码 if(choseRemember){ mAccount.setText(name); mPwd.setText(pwd); mRememberCheck.setChecked(true); } mRegisterButton.setOnClickListener(mListener); //采用OnClickListener方法设置不同按钮按下之后的监听事件 mLoginButton.setOnClickListener(mListener); mCancleButton.setOnClickListener(mListener); mChangepwdText.setOnClickListener(mListener); ImageView image = (ImageView) findViewById(R.id.logo); //使用ImageView显示logo image.setImageResource(R.drawable.logo); if (mUserDataManager == null) { mUserDataManager = new UserDataManager(this); mUserDataManager.openDataBase(); //建立本地数据库 } } OnClickListener mListener = new OnClickListener() { //不同按钮按下的监听事件选择 public void onClick(View v) { switch (v.getId()) { case R.id.login_btn_register: //登录界面的注册按钮 Intent intent_Login_to_Register = new Intent(Login.this,Register.class) ; //切换Login Activity至User Activity startActivity(intent_Login_to_Register); finish(); break; case R.id.login_btn_login: //登录界面的登录按钮 login(); break; case R.id.login_btn_cancle: //登录界面的注销按钮 cancel(); break; case R.id.login_text_change_pwd: //登录界面的注销按钮 Intent intent_Login_to_reset = new Intent(Login.this,Resetpwd.class) ; //切换Login Activity至User Activity startActivity(intent_Login_to_reset); finish(); break; } } }; public void login() { //登录按钮监听事件 if (isUserNameAndPwdValid()) { String userName = mAccount.getText().toString().trim(); //获取当前输入的用户名和密码信息 String userPwd = mPwd.getText().toString().trim(); SharedPreferences.Editor editor =login_sp.edit(); int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd); if(result==1){ //返回1说明用户名和密码均正确 //保存用户名和密码 editor.putString("USER_NAME", userName); editor.putString("PASSWORD", userPwd); //是否记住密码 if(mRememberCheck.isChecked()){ editor.putBoolean("mRememberCheck", true); }else{ editor.putBoolean("mRememberCheck", false); } editor.commit(); Intent intent = new Intent(Login.this,User.class) ; //切换Login Activity至User Activity startActivity(intent); finish(); Toast.makeText(this, getString(R.string.login_success),Toast.LENGTH_SHORT).show();//登录成功提示 }else if(result==0){ Toast.makeText(this, getString(R.string.login_fail),Toast.LENGTH_SHORT).show(); //登录失败提示 } } } public void cancel() { //注销 if (isUserNameAndPwdValid()) { String userName = mAccount.getText().toString().trim(); //获取当前输入的用户名和密码信息 String userPwd = mPwd.getText().toString().trim(); int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd); if(result==1){ //返回1说明用户名和密码均正确 Toast.makeText(this, getString(R.string.cancel_success),Toast.LENGTH_SHORT).show();//注销成功提示 mPwd.setText(""); mAccount.setText(""); mUserDataManager.deleteUserDatabyname(userName); }else if(result==0){ Toast.makeText(this, getString(R.string.cancel_fail),Toast.LENGTH_SHORT).show(); //注销失败提示 } } } public boolean isUserNameAndPwdValid() { if (mAccount.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.account_empty), Toast.LENGTH_SHORT).show(); return false; } else if (mPwd.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.pwd_empty), Toast.LENGTH_SHORT).show(); return false; } return true; } @Override protected void onResume() { if (mUserDataManager == null) { mUserDataManager = new UserDataManager(this); mUserDataManager.openDataBase(); } super.onResume(); } @Override protected void onDestroy() { super.onDestroy(); } @Override protected void onPause() { if (mUserDataManager != null) { mUserDataManager.closeDataBase(); mUserDataManager = null; } super.onPause(); }}package com.example.foolishfan.user_v10;import android.app.Activity;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class Register extends AppCompatActivity { private EditText mAccount; //用户名编辑 private EditText mPwd; //密码编辑 private EditText mPwdCheck; //密码编辑 private Button mSureButton; //确定按钮 private Button mCancelButton; //取消按钮 private UserDataManager mUserDataManager; //用户数据管理类 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.register); mAccount = (EditText) findViewById(R.id.resetpwd_edit_name); mPwd = (EditText) findViewById(R.id.resetpwd_edit_pwd_old); mPwdCheck = (EditText) findViewById(R.id.resetpwd_edit_pwd_new); mSureButton = (Button) findViewById(R.id.register_btn_sure); mCancelButton = (Button) findViewById(R.id.register_btn_cancel); mSureButton.setOnClickListener(m_register_Listener); //注册界面两个按钮的监听事件 mCancelButton.setOnClickListener(m_register_Listener); if (mUserDataManager == null) { mUserDataManager = new UserDataManager(this); mUserDataManager.openDataBase(); //建立本地数据库 } } View.OnClickListener m_register_Listener = new View.OnClickListener() { //不同按钮按下的监听事件选择 public void onClick(View v) { switch (v.getId()) { case R.id.register_btn_sure: //确认按钮的监听事件 register_check(); break; case R.id.register_btn_cancel: //取消按钮的监听事件,由注册界面返回登录界面 Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ; //切换User Activity至Login Activity startActivity(intent_Register_to_Login); finish(); break; } } }; public void register_check() { //确认按钮的监听事件 if (isUserNameAndPwdValid()) { String userName = mAccount.getText().toString().trim(); String userPwd = mPwd.getText().toString().trim(); String userPwdCheck = mPwdCheck.getText().toString().trim(); //检查用户是否存在 int count=mUserDataManager.findUserByName(userName); //用户已经存在时返回，给出提示文字 if(count>0){ Toast.makeText(this, getString(R.string.name_already_exist, userName),Toast.LENGTH_SHORT).show(); return ; } if(userPwd.equals(userPwdCheck)==false){ //两次密码输入不一样 Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show(); return ; } else { UserData mUser = new UserData(userName, userPwd); mUserDataManager.openDataBase(); long flag = mUserDataManager.insertUserData(mUser); //新建用户信息 if (flag == -1) { Toast.makeText(this, getString(R.string.register_fail),Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(this, getString(R.string.register_success),Toast.LENGTH_SHORT).show(); Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ; //切换User Activity至Login Activity startActivity(intent_Register_to_Login); finish(); } } } } public boolean isUserNameAndPwdValid() { if (mAccount.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.account_empty), Toast.LENGTH_SHORT).show(); return false; } else if (mPwd.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.pwd_empty), Toast.LENGTH_SHORT).show(); return false; }else if(mPwdCheck.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.pwd_check_empty), Toast.LENGTH_SHORT).show(); return false; } return true; }}package com.example.foolishfan.user_v10;import android.app.Activity;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.RelativeLayout;import android.widget.Toast;public class Resetpwd extends AppCompatActivity { private EditText mAccount; //用户名编辑 private EditText mPwd_old; //密码编辑 private EditText mPwd_new; //密码编辑 private EditText mPwdCheck; //密码编辑 private Button mSureButton; //确定按钮 private Button mCancelButton; //取消按钮 private UserDataManager mUserDataManager; //用户数据管理类 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.resetpwd); mAccount = (EditText) findViewById(R.id.resetpwd_edit_name); mPwd_old = (EditText) findViewById(R.id.resetpwd_edit_pwd_old); mPwd_new = (EditText) findViewById(R.id.resetpwd_edit_pwd_new); mPwdCheck = (EditText) findViewById(R.id.resetpwd_edit_pwd_check); mSureButton = (Button) findViewById(R.id.resetpwd_btn_sure); mCancelButton = (Button) findViewById(R.id.resetpwd_btn_cancel); mSureButton.setOnClickListener(m_resetpwd_Listener); //注册界面两个按钮的监听事件 mCancelButton.setOnClickListener(m_resetpwd_Listener); if (mUserDataManager == null) { mUserDataManager = new UserDataManager(this); mUserDataManager.openDataBase(); //建立本地数据库 } } View.OnClickListener m_resetpwd_Listener = new View.OnClickListener() { //不同按钮按下的监听事件选择 public void onClick(View v) { switch (v.getId()) { case R.id.resetpwd_btn_sure: //确认按钮的监听事件 resetpwd_check(); break; case R.id.resetpwd_btn_cancel: //取消按钮的监听事件,由注册界面返回登录界面 Intent intent_Resetpwd_to_Login = new Intent(Resetpwd.this,Login.class) ; //切换Resetpwd Activity至Login Activity startActivity(intent_Resetpwd_to_Login); finish(); break; } } }; public void resetpwd_check() { //确认按钮的监听事件 if (isUserNameAndPwdValid()) { String userName = mAccount.getText().toString().trim(); String userPwd_old = mPwd_old.getText().toString().trim(); String userPwd_new = mPwd_new.getText().toString().trim(); String userPwdCheck = mPwdCheck.getText().toString().trim(); int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd_old); if(result==1){ //返回1说明用户名和密码均正确,继续后续操作 if(userPwd_new.equals(userPwdCheck)==false){ //两次密码输入不一样 Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show(); return ; } else { UserData mUser = new UserData(userName, userPwd_new); mUserDataManager.openDataBase(); boolean flag = mUserDataManager.updateUserData(mUser); if (flag == false) { Toast.makeText(this, getString(R.string.resetpwd_fail),Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(this, getString(R.string.resetpwd_success),Toast.LENGTH_SHORT).show(); mUser.pwdresetFlag=1; Intent intent_Register_to_Login = new Intent(Resetpwd.this,Login.class) ; //切换User Activity至Login Activity startActivity(intent_Register_to_Login); finish(); } } }else if(result==0){ //返回0说明用户名和密码不匹配，重新输入 Toast.makeText(this, getString(R.string.pwd_not_fit_user),Toast.LENGTH_SHORT).show(); return; } } } public boolean isUserNameAndPwdValid() { String userName = mAccount.getText().toString().trim(); //检查用户是否存在 int count=mUserDataManager.findUserByName(userName); //用户不存在时返回，给出提示文字 if(count<=0){ Toast.makeText(this, getString(R.string.name_not_exist, userName),Toast.LENGTH_SHORT).show(); return false; } if (mAccount.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.account_empty),Toast.LENGTH_SHORT).show(); return false; } else if (mPwd_old.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.pwd_empty),Toast.LENGTH_SHORT).show(); return false; } else if (mPwd_new.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.pwd_new_empty),Toast.LENGTH_SHORT).show(); return false; }else if(mPwdCheck.getText().toString().trim().equals("")) { Toast.makeText(this, getString(R.string.pwd_check_empty),Toast.LENGTH_SHORT).show(); return false; } return true; }}package com.example.foolishfan.user_v10;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;public class User extends AppCompatActivity { private Button mReturnButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); mReturnButton = (Button)findViewById(R.id.returnback); } public void back_to_login(View view) { Intent intent3 = new Intent(User.this,Login.class) ; startActivity(intent3); finish(); }}二、功能分析
上面工程涉及到的这些内容，在网上有很多写的很有参考价值的资料，建议可单独熟悉各个部分内容，然后添加功能到已有代码基础上，由于好多天后才整理的博客，缺少很多刚学习时遇到的种种错误及其解决方法，细节之处还望多交流。
<1>：Button，TextView，TextEdit，ImageView，RatioButton等基本控件的使用
<2>：多个Activities之间的切换
<3>：使用Android本地数据库来管理用户信息
1：登录功能
通过登录按钮的监听事件实现登录，登录过程中需要判断用户名是否存在，密码是否正确，核心函数： public void login() { //登录按钮监听事件 if (isUserNameAndPwdValid()) { String userName = mAccount.getText().toString().trim();//获取当前输入的用户名和密码信息 String userPwd = mPwd.getText().toString().trim(); SharedPreferences.Editor editor =login_sp.edit(); int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd); if(result==1){ //返回1说明用户名和密码均正确 //保存用户名和密码 editor.putString("USER_NAME", userName); editor.putString("PASSWORD", userPwd); //是否记住密码 if(mRememberCheck.isChecked()){ editor.putBoolean("mRememberCheck", true); }else{ editor.putBoolean("mRememberCheck", false); } editor.commit(); Intent intent = new Intent(Login.this,User.class) ; startActivity(intent); finish(); Toast.makeText(this, getString(R.string.login_success),Toast.LENGTH_SHORT).show();//登录成功提示 }else if(result==0){ Toast.makeText(this, getString(R.string.login_fail),Toast.LENGTH_SHORT).show(); //登录失败提示 } } }2：注册功能
登录界面上点击注册按钮，进入对应监听事件，直接实现从Login的Activity到Register的Activity的跳转，然后在Register的Activity上实现用户注册，核心函数：
public void register_check() { //确认按钮的监听事件 if (isUserNameAndPwdValid()) { String userName = mAccount.getText().toString().trim(); String userPwd = mPwd.getText().toString().trim(); String userPwdCheck = mPwdCheck.getText().toString().trim(); //检查用户是否存在 int count=mUserDataManager.findUserByName(userName); //用户已经存在时返回，给出提示文字 if(count>0){ Toast.makeText(this, getString(R.string.name_already_exist, userName),Toast.LENGTH_SHORT).show(); return ; } if(userPwd.equals(userPwdCheck)==false){ //两次密码输入不一样 Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show(); return ; } else { UserData mUser = new UserData(userName, userPwd); mUserDataManager.openDataBase(); long flag = mUserDataManager.insertUserData(mUser); //新建用户信息 if (flag == -1) { Toast.makeText(this, getString(R.string.register_fail),Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(this, getString(R.string.register_success),Toast.LENGTH_SHORT).show(); Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ; startActivity(intent_Register_to_Login); finish(); } } } }3：修改密码功能
在登录界面点击“修改密码”即可进入对应的Resetpwd的Activity，实现用户密码的修改，核心函数：
public void resetpwd_check() { //确认按钮的监听事件 if (isUserNameAndPwdValid()) { String userName = mAccount.getText().toString().trim(); String userPwd_old = mPwd_old.getText().toString().trim(); String userPwd_new = mPwd_new.getText().toString().trim(); String userPwdCheck = mPwdCheck.getText().toString().trim(); int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd_old); if(result==1){ //返回1说明用户名和密码均正确,继续后续操作 if(userPwd_new.equals(userPwdCheck)==false){ //两次密码输入不一样 Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show(); return ; } else { UserData mUser = new UserData(userName, userPwd_new); mUserDataManager.openDataBase(); boolean flag = mUserDataManager.updateUserData(mUser); if (flag == false) { Toast.makeText(this, getString(R.string.resetpwd_fail),Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(this, getString(R.string.resetpwd_success),Toast.LENGTH_SHORT).show(); mUser.pwdresetFlag=1; Intent intent_Register_to_Login = new Intent(Resetpwd.this,Login.class) ; startActivity(intent_Register_to_Login); finish(); } } }else if(result==0){ //返回0说明用户名和密码不匹配，重新输入 Toast.makeText(this, getString(R.string.pwd_not_fit_user),Toast.LENGTH_SHORT).show(); return; } } }4：注销功能
注销功能直接在登录界面，当用户名和密码均正确时，点击注销按钮将直接注销用户【各位可根据需求将注销放在个人中心里面进行操作】。核心函数：
public void cancel() { //注销 if (isUserNameAndPwdValid()) { String userName = mAccount.getText().toString().trim(); //获取当前输入的用户名和密码信息 String userPwd = mPwd.getText().toString().trim(); int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd); if(result==1){ //返回1说明用户名和密码均正确 Toast.makeText(this, getString(R.string.cancel_success),Toast.LENGTH_SHORT).show();//登录成功提示 mPwd.setText(""); mAccount.setText(""); mUserDataManager.deleteUserDatabyname(userName); }else if(result==0){ Toast.makeText(this, getString(R.string.cancel_fail),Toast.LENGTH_SHORT).show(); //登录失败提示 } } }5：记住密码
当记住密码的RadioButton为真时，系统将记住此时用户登录的信息，用户在下次登录时可避免再次输入用户名和密码的麻烦，实现细节在Login的Activity中。这里给一个大牛用SharedPreferences做的记住密码连接：这里
三、工程源码下载
初学不久，工程代码中可能存在一些bug，望各位不吝指出，有个bug测试出来了，就是在记住密码之后对该账户进行密码修改后返回登录界面，此时记住的密码为原来的密码，不可登陆，我相信这个小bug是难不到你们的，^_^。 例程源码User_V2.0
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